Gustave x



G.L. HERZ.

SPARK PLUG.

APPLICATION FILED 0CT.25| 1915.y

Patented June 10, 1919.

.eraan-mme.

receso@ To all lwho/ii 'it may C omci'ii:

` va citizen ofthe United States, andresidcnt.-

Be it known thatl, (us'rAvn L.. -l-lniia,

'of the loorough'of ll/Ianhattain'in vthe city and State of New York,have invented a new and useful y `liiiproven'ient in Spark-Plugs,

of which the following is a specification.

The object of my invention is tov providel certain improvements in theconstruction,

of the sparking electrodes becoming clogged with oil is eliminated;second, the protectionI of theoutwardly projecting portion of betweenlthe conducting cable and the spark the'insulating bloc-k is'.i1isurcd,.and third, the protectionv of the 'electrical connectionplug is insured.

' ,A practical embodiment of my invention -ings, in -ivhich`, Figure 1is auv oiite'rvendv View of theplug,

- Fig.' 2 is a sideview ofthe plug.

Fig.. 3 is a longitudinal central section vthrough the plug, and Fig. 4is an inner endview ofthe plug.

The insulator hasn-n enlarged middle portion land' reduced ends 2, 3,forming exiii terior sliouldrs 4, A5: The hollow shell 6 is' "providedwith interiorshoulders 7, 8, b etween4 which and the; shoulders 4,5,aretinteiposedgaskets 9`, 10,'for spacing tlie' in` siilator from theinner Walls of the shell;

" insulating coi-o16, against the linner end orf I dii'ctor to theblock.

iii

outer end of the `shell Theoiiterend of: the .hood has a. recess 19, thebottom of- Which is substantially-flush with the outer Specificationif-Letters Patent.

' portion of the conductor-.i3 and extends vented. A

. A hood .17 of'.'insulating.-material surf ,laitenfied June iid. roi i.

va'ppi'iaiiim nica october 25, 1915." sensi an. amies.

face of the nut lll. exterioranniilai seal;

20 is providedat the outer' end oi. hood. forre'eeivin the annular'@ange 2li of. the 'nougcondueting outer portionoi ao i. the metallicconducting -innerportion El@ i which slides freely along theserevvrvhieaf u'ardly beyoiidthe inneriaee of the nonn vconductingportion 22, into the recess l@ form and `arrangement of the 'severalparts v- Afofa spark plug whereby, iirsl', the liabilityy and formstogether'with the ilange iii, a cess for receivinw `the annular flange2li. at

vthe outer end oi; vthe saidhood l?.

.Athunib nut comprising a ii'ietallieiinaer conducting" port-ien 25 `andan outer non# engagement with Vthe outer end'. ofthe conconducting innerportion the can for forcing the cap vinto snug' engagement viii/li theouter end 'of the hood 1f?.-

The electric conducting; cable comprises the usual core 27 andvprotective eovering'id,

which eye surrounds the conductor i3.- The 4screwthreaded portion ofthe' screw eye is engaged with the core 27 of the electricl conductingcable and the vcoveringn of 'the Vseid cableis inserted betweenv thehood li condi'ictingg portion 26,has a sereviifiireaded '.diictor i8,and lbears, against the ii'ietallie and the cap by cutting away the sideWalls i of the hood and nap, as indicatedat 36,31. T he inner end of theshell 6 `foi-'nis one of the sparking `electrodes. In the presentjin'?.stancefthis inner end comprises` a skeletonv disk -11 clamped to theshell, provided with -spirallyarranged.arnis 12' presenting. their endslatw-iseto the opposite sidesof the in-v ner end of the conductor 13which extends axially t-li'iougli the insulator-,and forms tl.e .oth erspai'kiuibelerfrode.' A iiiit'll--oii-` 'gages the 'screwsthreaded'outerend of the conductor 13- and serves, 4 togifetl-ier with the shoulder15.' on the said conducto aiidtlie shown at 32. at the cutaway portion3l, to

pre-vent any danger of the cap l'ieeoiiiii'igl broken at this point whenpressurefis ago plied thereto' bythe thumb nui.; j

Froiii-the abovedcsoriptioii'it vi'ill be seen that byiii'ovidingr'spirally arranged arias for the sparking electrode of theshell, the laeeu'in'uhition o foil on the said arms is prelltfwillfurthern'iorebe seen that the' pro-- l p vision of the hood materiallystrengthens which the shoulder bears, to secure the con#v4 the exposedend. of the spark plug; and thi f will the conneeting'end of theconducting cable l' isvery completely andi ed'ectually housed,i notonly'the screw eye terminal beingy pro teeted but also the vend. of thecovering ,of the cable. 4

ltvvill furthermore be seen that the' cable may lee-ledin any directionfrom the spar plug by looseningthe thumb nut euiileientljf toperiiiittlie rotative movement of hood and its cap, the cable beingclamped in any desiredl relative position by simply tighten-' ing thethumb nut to the desired extent.

Any liability of the hood becoming broken vis obviated by the copper orother1 soft metal rimat its inner end and the engagement 'of thenon-conducting outer portion of the cap with its outer end. At the sametime it will be seen that the'pressure appliedby .the screwing up of the'thumb nut will be chiefiy against 'he vmetallic conducting elements,thus relieving the non-metall1c or non-conducting elements Vfrom thisstrain. I

It is' evident that varlous changes may be resorted to vin' the form,constructionr'and arrangement of the. several parts. Withoutdepartingfrom the spirit and scope of my invention, and hence I do notWishto limit myself-strietly to the structure herein set I 1 1. In aspark plug, the shell, insulator and conductor, the inner endl of theshell having spirally arranged arms presenting their ends to the innerend of the conductor. l

2. Ina spark plug, the shell, insulator and conductor, the inner end ofthe shell having flat spirally arranged arms twisted -f to present.their ends to the inner end of 1 the conductor.

- 3. In a spark plug, the shell, insulator and conductor and askeletondisk ai; the inner end of the shell having spirali; arranged armspresenting their ends to the inner end of the conductor.

v Y 4. -In a spark plug, the shell insulator and conductor 4and askeleton disk at the inner end of the shell provided lWith flat spirallyarranged arms twisted to resent their ends latwi'se tothe inner end othe condzctor.

"7. In a sparkfplug, the' shell, insulator and conductor, anonfconducting' hoo'd and a non-conducting cap arranged to receive loetween them the terminalof a. 'conducting cable, and means for clamp' 'gthe hood, ters minal andcap in pgsition.

8. In a spark plug, the shell,insulatorl and conductor, a'non-conducting hood 'and a non-'conducting shaped toY snugly leinat theinner i `clamping the hood,'ca) le an .In testimony, that I claim theforegoing 115 brace the terminalof'a conducting cable, and means forclampingV the hood, terminal and. cap in position;

recess in its outer .end .forreceiving the terminal of a conductingoa-ble,1a non-conduct#I 'ing 4cap for fclosingsaid recessy and meansforclamping the hood, terminal and cap in po sition. v j v 10. In asparkplu'g, the shell, insulator' Vand conductor, a nonfcondueting hoodhaving a recess-1n itsvouter end for recelvmg thei terminal ofafconducti'ng cable, 'a non-con'-v ducting cap for closino-'said recessand means for clamping the hoo terminal and cap in' position, said capand ood being-shaped tosnugly embrace the said cable. 1-

11. In a-'spark plug, vthe shell,"ins'u.lator,

`. conductorand its securing nut, a non-conducting hood and anonlconducting capv for# receivingbetween them' the terminal rof'a `9.In' va's'park plug, the shell, insulatorand i conductorfa non-conductinghood havinga f i protective Acovering of so A.

conducting cable, andinieanswfpr clamping cap having a metallicconducting inner portion for pressing the terminalagainst said:-v nut. 1

conductor and its securn ducting hoodand a cap or receiving between themthe terminal of a conductin cable, a thumb nut for clamping the hoo 12.In a'ispark-plug, the shell, insulator, i nut, a non-con- 4' terminaland cap in position, said cap and thumb nut both havingnon-conductingouter portions and metallic inner portions.. l

13.- In a spark plug, the shell, inslalor and conductor, anon-conductinghood and a non-conducting cap arrangedv to. receive be-v tween them theterminal and protective cov. ering of .a conducting cable and means forclamping the hood, cable and 'ca 4 together.

14. In -a spark plug, the shell? and conductor,- a 4non-conducting hood,a

insulator cap having' a conducting inner portion and a non-conducting-.outer portion, a nut en- :waging the conductor and located Within the"vood, the hood andthe nonconducting portion of the cap being arranged tovreceive the protective covering of a conducting" cable and the said-nutand conductingplortio'nfofl the cap being arranged'toreceivethe-terminal of said conductin cable and means for (I c 'aptogether.'

as-my invention, I have 'signed my name '-'v/this'23rd day of October,1915,'

' GSTAvn Lf;- HER-z.-

